Drying characteristic curve

...The drying rate is often expressed as the amount of water that evaporates per unit time per unit surface area of ​​material (dry area), or the amount of water that evaporates per unit time per unit weight of anhydrous material.
[Three drying periods and drying characteristic curves]
When a porous material specimen that is sufficiently wet to the surface is hung in hot air and the changes in the moisture content and surface temperature of the specimen are tracked, the results shown in Figure 1 are observed. In the figure, I is the period from the initial temperature, such as room temperature, until the material reaches a certain dynamic equilibrium temperature determined by the drying conditions in this case, during which drying progresses to some extent, but the material is mainly heated, and is called the material preheating period. …

*Some of the terms mentioned in the "drying characteristic curve" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…乾燥速度は，単位材料表面積(乾燥面積)当り単位時間に蒸発する水分量，もしくは単位無水材料重量当り単位時間に蒸発する水分量でもって示されることが多い。
［乾燥の3期間と乾燥特性曲線］
　表面まで十分湿った多孔質材料試片を熱風中につるし，試片の含水率と表面温度の変化を追跡すると図1のような結果が観測される。図中Iは，材料が初期温度たとえば室温からこの場合の乾燥条件で定まるある動的平衡温度に達するまでの，乾燥もいくぶん進行するが主として材料加熱の期間で，材料予熱期間という。…

※「乾燥特性曲線」について言及している用語解説の一部を掲載しています。

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